Spark-plug.



No. 895,030. 'PUBMED AUG. 4, 1908.

J. LANG.

SPARK PLUG.

APPLICATION TILED H04V25, 1901.

JAMES LANG, OF CAVALIER, NORTH DAKOTA.

SPARK-15mm.

To all whom 'it may concern:

Be it known that I, JAMES LANG, a citizen of the United States, residing at Cavalier, in the county of Pembina and State of North Dakota, have invented certain new and uscful Improvements in Spark-Flu s; and I do declare the following to be a fu l, clear, and exact description of the invention, such as will enable others skilled in the art to which it apIpertains to make and use the same. l T s invention has relation to new and useful improvements in spark plugs. Y The principal object of the invention'isto providea simple and efficiently operating device of this kind capable of producing both a first and second spark, the second spark being of greater intensit and volume than the first. and consequent y increasing the etilciency of any internal combustion engine employing a jump spark coil wherein it is vlit thefore-going and other objects in view, the invention consists of certain novel features of construction, combination and arran ement of partsfas will be more fully descri ed and particularly pointed out in the ap ended claims.

nthe accompanying drawings: The gure is a central longitudinal sectional view of the invention, represented asl being applied to one wall of the combustion chamber of an internal combustion engine. Referring more articularly to the drawings which are for i lustrative purposes only, and therefore are not drawn to scale, the numeral 1 indicates an outer-tubular casing or member. having a screu` thread 2 at its inner end adapted for screwed engagement with either-of the walls 3 of the combustion chamber of an engine. The bore of said casing is preferably dereasingly tapered from its inner end and closel) fitted in said bore, is a correspondingly ta )ered sleeve 4 of suitable insulating material. Said sleeve is formed at its outer end with an annular outstanding flange 5 for engaging with the outer end of the casing 1 to maintain it against inward dis lacement, and with a central bore pref era ly tapered to correspond with the taper of the boreof the outer casing. In carrying out the invention, a tube 6, is closely fitted in the bore of member 5, its outer end being screw threaded as at 'I and projecting beyond the adjacent endof memer 5 and its inner or opposite end projecting inwardly beyond the inner end of the o uter i Specification of Letters Patent.

applicati@ mea November 25, 1907. serial No. 403,774.

PatentedAugxl, 1908.v

casing 1 and being bent outwardly to form an 'annular flange 8. To maintain said plug against inward displacement a fastening nut annular flange or shoulder 12 having an out` wardly-extending laterally bent finger oreX- tension formed on its outer face, the purpose of which will be disclosed.

Formed lon the inner face and end of the outer tubular casing or member 1, and spaced a suitable distance from the shoulder of the tube 6 is an inwardly Vextending finger orextension 14.

A sleeve 14 of rubber or other suitable in-- sulating materialis arranged ip.. the tube 6 around the body ofthe conductlng rod or core 10, the inner end of the sleeve resting on the lange or shoulder 12, formed at the inner nected with the cutel` threaded end of the core by a thumb-nut 17 and the nega.- tive or return wire 18 being electrically connected with the wall 3 by a contact screw 19.

- In the operation of the invention the current passes ortravels along the core 10 until it reaches the Iingeror extension 13 formed at the inner end thereof-from which point it I jumps across the air gap 20 to the flange 8 of the tube 6, producing the rst spark, and thence from said flange to the extension 14 producing the second'spark. Thismethod of simultaneously producing first and second sparks is a particular feature of the invention, as the second spark will be of greater intensity Aand volume than the first and I the compressed gases in the combustion chamber are more readily ignited and as a result the efficiency of the engine materially increased.

Having thus described the nature of my invention, what I claim as new and desire to secure by Letters-Patent, is: l

1. A spark plug of the character s ecied, comprising an outer casing, forme at its winner endv with a laterally extending fniger,

av central tube arranged within the casing, theouter end of the tube being screw threadedand projecting beyond the outer end of the casing, a fastening nut screwing upon the projecting end of the tube to retain the same in position, a sleeve of insulating inaterial arranged between the casing and tube, the outer end of the sleeve being formed with an out-turned flange to engage vthe adjacent endof the casing, a central conducting core extending longitudinally through the plug, the inner end ofthe core being formed with a laterally extending linger, a sleeve of insulating material arranged between the conducting core and tube, and electrical connections vfor connecting the spark plug with a source of energy.

2. A spark plug of the character s ecilicd comprising an outer casing forme at its inner end with a laterally extending finger, a central tube extending longitudinally through the. casing', the inner end of the tube being formed with an out-turned annular flange, a sleeve of insulating material ar.- ranged between the casing and tube, the outer end of thesleeve being formed with an out-turned flange to bear upon the ad jacent end of thc casing and the inner end of the sleeve bearing upon the tube flange, a conducting core extending longitudinally sulating material arranged between the casing' and tube, the inner end of the sleeve 45 bearing upon the frange of the tube. and the outer end of the sleeve being formed with an out-turned ange to bear u on the casing, a'

sleeve of insulating materia arranged inthe I l tube, and a central conducting core eXtending through the sleeve, the inner end of the core being formed `,rl-ith a Hange to support the sleeve in position, and with a laterally extending linger beg-end the flange.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses,

, y p JAMES LANG/ Witnesses: l 

